Combination metal punch and shear



Se t. 23, 1969 w. M. BAKULA 3,468,206

COMBINATION METAL PUNCH AND SHEAR Filed D90. 14, 1966 2 Sheets-Sheet l IN V E N TOR.

I149; raw/K Ema/m W. M. BAKULA Sept. 23, 1969 Filed Dec. 14, 1 966 24 :3 i 51 M 4 5x 5; i 2/ A A5"; lnllll A; 22 I" Q /7 /6 o o 53 will 0 0' m COMBINATION METAL PUNCH AND SHEAR 2 Sheets-Sheet 2 INVENTOR- Mu new 07. 54mm tates 3,468,206 COMBINATION METAL PUNCH AND SHEAR Walter M. Bakula, 3770 S. Jason St., Englewood, Colo. 80110 Filed Dec. 14, 1966, Ser. No. 601,667 Int. Cl. B26d /08, 5/12 U.S. Cl. 83-599 2 Claims ABSTRACT OF THE DISCLOSURE BRIEF SUMMARY OF THE INVENTION A conventional custom metal working shop usually requires a shear for cutting steel plates, a shear for cutting structure shapes such a angle iron or channel iron and a punch press for die forming metal plates and for punching bolt or rivet holes in the plates and shapes. The above shop tools are exceedingly expensive and require considerable floor space so that it is rather diflicult for the average mechanic to set up shop for this type of work.

The principal object of this invention is to provide a single highly eflicient hydraulically-operated tool unit which will perform all of the functions of the above individual units, which will be economical to manufacture and which will require .a minimum of floor space and which will require only a single hydraulically-operated lever to multiply the hydraulic effort so as to reduce the size and cost of the necessary hydraulic mechanism without reducing the pressures applied to the work.

Other objects and advantages reside in the detail construction of the invention, which is designed for simplicity, economy, and efiiciency. These will become more apparent from the following description.

In the following detailed description of the invention, reference is made to the accompanying drawing which forms a part hereof. Like numerals refer to like parts in all views of the drawing and throughout the description.

In the drawing:

FIG. 1 is a right-side elevational view of the improved metal working tool;

FIG. 2 is a fragmntary rear end elevational view thereof;

FIG. 3 is a front end elevational view thereof;

FIG. 4 is a fragmentary vertical cross section taken on the line 4-4, FIG. 1;

FIG. 5 is an enlarged vertical cross section taken on the line 55, FIG. 1; and

FIG. 6 is a detail perspective view of a lever-beam as employed in the invention.

The invention employs a horizontally-elongated, flat, vertically-positioned, relatively thick, lever-beam 12 which is pivotally mounted adjacent its forward extremity and adjacent its lower edge upon a horizontally positioned fulcrum bolt 13 so that it can be reciprocally swung in a vertical plane through the medium of a piston rod 14 extending from a hydraulic cylinder 15.

The fulcrum bolt 13 extends through a bearing bore 13' in the beam 12 and is supported between two supporting plates 16 which are welded to or otherwise mounted on the forward extremity of a base box 17 which may have any desired sturdy construction. As illustrated, the base atent O 3,468,206 Patented Sept. 23, 1969 ice box consists of two spaced-apart side panels 18, a top plate 19 and a bottom plate 20 all rigidly secured together to form the supporting base box 17.

The rear extremities of the side panels 18 are extended rearwardly and upwardly to form spaced-apart, supporting standards 21, adjacent the upper extremities of which, a horizontal cylinder-suspension bolt 22 extends. The top of the cylinder 15 is closed by a top head 23 having integral cars 24 through which the bolt 22 passes to pivotally support the cylinder over the rear extremity of the lever beam 12. The bottom of the cylinder is closed by means of a bottom head 25 through which the piston rod 14 extends from a conventional piston 26 positioned within the cylinder. The lower extremity of the piston rod 14 is arcuately rounded, as indicated at 27, to interflt into an arcuate concavity 28 formed in the top of the rear extremity of the lever beam 12. The rounded lower extremity 27 is snugly maintained in the concavity 28 by means of a wrist bolt 29 which passes diametrically through the piston rod and extends through bolt holes 29' in two bearing plates 30 which are welded to the opposite sides of the lever beam at the concavity 28. The opposite sides of the piston rod 14 are flattened, as indicated at 31, to fit closely between the bearing plates 30 as shown in FIG. 5. The cylinder 15 is provided with the conventional nipples 32 for admitting and discharging hydraulic fluid under pressure to opposite sides of the piston 26.

A bed plate 33 is mounted on the top plate 19 of the base box 17 and one or more stationary lower shearing blades are mounted upon the bed plate to suit the work to be done. As illustrated, the lower shearing blades comprise a lower angle blade 34 and a lower plate blade 35. As can be seen in FIG. 4, the lower plate blade 35, is removably and adjustably attached to the bed plate 33 by means of recessed cap screws 36. The lower angle blade 34 is similarly secured upon the bed plate. An upper angle blade 37 and .an upper plate blade 38 are recessed, as indicated at 39 and 40, into the front face of the lever beam 12 adjacent the lower edge thereof and in shearing relation to the lower angle blade 34 and to the lower plate blade 35, respectively. The upper blades are secured in their respective recesses 39 and 40 by means of suitable cap bolts 41 which extend thru bolt holes 41 in the beam 12 and are threaded into the blades 37 and 38, as shown in FIG. 4.

It can be seen from the above, that if hydraulic fluid be admitted above the piston 26 the rear extremity of the lever beam 12 will be forced downwardly to shear metal work pieces placed upon the lower blades 34 and 35 and that the rounded extremity 27 and the concavity 28 will transmit the downward hydraulic pressure to the lever beam 12 so as to relieve the wrist bolt 29 from the shearing stress.

It will also be noted that the downward pressure exerted by the shearing blades will be a multiplication of the downward pressure exerted by the piston rod 14. For instance, if the plate shearing blades 35 and 38 be positioned one half the distance between the fulcrum bolt 13 and the vertical center line of the cylinder, the shearing pressure exerted will be double that of downward pressure of the piston rod.

A punch press tool is provided by extending the forward extremity of the lever beam forwardly of the fulcrum bolt 13 and suspending a U-shaped yoke 42 from a pivot bolt 43 which extends thru a bolt hole 43 in the forwardly extending extremity of the lever beam 12. A punch pressure rod 44, terminating at its lower extremity in joint ball 45, is threaded downwardly through the bight of the yoke 42, as shown in FIG. 3. A punch mounting block 46 is mounted on and suspended from the ball 45. The mounting block 46 is slidably mounted for vertical reciprocation in a punch guide block 47 which is bolted to, as indicated at 48, and supported by a bracket plate 49 extending forwardly from between the supporting plates 16. A punch 50 is mounted on the bottom of the block 46 to enter a conventional punch die 51 supported therebelow upon an inverted channel beam 52 which extends forwardly from beneath the bottom plate 20. The punch and punch die structure, per se, may be of any conventional type. In this invention however the punch is operated from the lever beam 12 simultaneously with, but in opposite direction from, a plurality of shearing blades. Multiplication of pressure is also obtained at the punch due to the closer spacing between the pivot bolt 43 and the fulcrum bolt 13 than between the fulcrum bolt and the cylinder 15.

The mechanism as thus far described can be positioned for use upon a work bench or other supporting structure with suitable hydraulic hoses connecting the nipples 32 to a suitable pressure supply.

A self-contained unit can be provided by welding 21 side plate 53 to each side of the base box 17 and extending the side plates 53 downwardly to the bottom of the channel beam 52 thence outwardly to form base flanges 54. An elongated housing side panel 55 having an S-shaped cross section is then welded beneath each of the base flanges 54 and extended downwardly to a permanent attachment to a floor plate 56. The housing side panels 55 and the floor plate 56 form an enclosure in which conventional hydraulic equipment (not shown) such as a reservoir, a motor driven hydraulic pump, and a suitable valving mechanism may be mounted to form a portable self-contained, multiple purpose, unit.

The channel beam 52 is continued rearwardly below the cylinder 15 to form a press table 57 upon which any desired stationary die may be mounted to die press material from a descending die mounted in a die bracket 58 which is in turn mounted below the rear extremity of the lever beam 12 in any desired manner such as by suitable cap screws 59.

Thus, it can be seen that four metal working operations, such as, punching, structural-shearing, plate-shearing, and die pressing, can be simultaneously or individually carried out by a single hydraulically-operated lever beam and that variations in working pressure for the individual operations can be obtained from common bydraulic pressure by predetermining the positions of the operations longitudinally along the single lever beam.

While a specific form of the invention has been described and illustrated herein, it is to be understood that the same may be varied within the scope of the appended claims, without departing from the spirit of the invention.

Having thus described the invention what is claimed and desired to be secured by Letters Patent is:

1. A metal working tool comprising:

(a) a supporting base element;

(b) a pair of spaced-apart supporting elements extending upwardly from the forward extremity of said base element;

(c) a pair of spaced-apart supporting standards extending upwardly from the rear extremity of said base element;

(d) a lever pivot supported by and between said supporting elements;

(e) a lever beam pivotally mounted adjacent its forward extremity on said lever pivot and between said supporting elements and extending rearwardly over said base element to a position between said standards;

(f) a hydraulically expansible and contractable element supported by said standards over and connected with the rear extremity of said lever beam so that the expansion and contraction thereof will reciprocally swing said lever beam in a vertical plane about said lever pivot;

(g) an upper shearing blade mounted on and projecting below said lever beam rearwardly of said lever pivot;

(h) a lower shearing blade mounted on said base element in shearing relation to said upper shearing blade to shear metal as said lever beam descends;

(i) a punch die fixedly supported by said base element below the forward extremity of said lever beam and forwardly of said lever pivot;

( j) a punch guide block supported from said base element over said punch die;

(k) a punch slidably and vertically mounted in said punch block in punching relation to said punch die; and

(l) a yoke pivotally suspended from the forward extremity of said lever beam and operatively connected with said punch for urging the latter downwardly as the upper shearing blade moves upwardly.

2. A metal-working tool as described in claim 1 in which the hydraulically expansible and contractable element comprises:

(a) cylinder suspension bolt extending between said standards above the rear extremity of said lever beam;

(b) a pressure cylinder suspended from and extending downwardly from said suspension bolt;

(0) a piston in said cylinder;

(d) a piston rod extending from said piston thru the lower extremity of said cylinder into contact with the rear extremity of said lever beam for urging the latter downwardly;

(e) a wrist bolt pivotally securing said piston rod to said rear extremity for lifting the latter upwardly; (f) and means for introducing hydraulic pressure into said cylinder selectively above and below said piston for vertically reciprocating said lever beam.

References Cited UNITED STATES PATENTS 326,768 9/1885 McCarty 83-599 X 405,526 6/1889 Broadbooks 83-599 X 675,254 5/1901 Takken 83-599 855,766 6/1907 Gerlach 83-599 X 3,090,270 5/1963 Rhodes et a1. 83-599 X 3,140,634 7/1964 McDaniel 83-599 X WILLIAM S. LAWSON, Primary Examiner US. Cl. X.R. 83-639 

